Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun The roughly spherical volume of space, centered on the sun and extending into the Kuiper belt, that is composed of particles emitted from the sun and forms a bubble that displaces the interstellar medium.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun astronomy The region of space where interstellar medium is blown away by solar wind; the boundary, heliopause, is often considered the edge of the Solar System.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun the region inside the heliopause containing the sun and solar system

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